背水一战 Windows 10 (53) - 控件（集合类）: ItemsControl 的布局控件 - ItemsStackPanel, ItemsWrapGrid

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背水一战 Windows 10 (53) - 控件（集合类）: ItemsControl 的布局控件 - ItemsStackPanel, ItemsWrapGrid

作者：webabcd


介绍
背水一战 Windows 10 之 控件（集合类 - ItemsControl 的布局控件）

• ItemsStackPanel
• ItemsWrapGrid

示例
1、ItemsStackPanel 的示例
Controls/CollectionControl/ItemsControlDemo/LayoutControl/ItemsStackPanelDemo.xaml

<Page
    x:Class="Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl.ItemsStackPanelDemo"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    
    xmlns:common="using:Windows10.Common">

    <Grid Background="Transparent">
        <StackPanel Margin="10 0 10 10" Orientation="Horizontal">

            <StackPanel Margin="5">
                <!--
                    ItemsStackPanel - 虚拟化布局控件，ListView 的默认布局控件
                        Orientation - 子元素的排列方向
                            Vertical - 垂直排列，默认值
                            Horizontal - 水平排列
                        CacheLength - 可见区外的需要缓存的数据的大小（以可见区条数大小的倍数为单位），默认值为 4.0
                            比如当可见区可以显示 10 条数据，CacheLength 为 4 时，可见区外的需要缓存的数据的大小则为 4 * 10 = 40，也就是说整个缓存数据的大小为 10 + 4 * 10 = 50
                            实际测试发现，可能会有一定的偏差，但是大体是准确的
                -->
                <ListView Name="listView1" Margin="5" Width="400" Height="400" HorizontalAlignment="Left" ItemsSource="{x:Bind MyData.View}">
                    <ListView.ItemTemplate>
                        <DataTemplate x:DataType="common:NavigationModel">
                            <Grid Background="Blue">
                                <TextBlock Text="{x:Bind Title}" />
                            </Grid>
                        </DataTemplate>
                    </ListView.ItemTemplate>
                    <ListView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <ItemsStackPanel Orientation="Vertical" CacheLength="4" />
                        </ItemsPanelTemplate>
                    </ListView.ItemsPanel>
                </ListView>
                <TextBlock Name="lblMsg1" Margin="5" />
            </StackPanel>

            <StackPanel Margin="5">
                <!--
                    ItemsStackPanel - 虚拟化布局控件，ListView 的默认布局控件
                        GroupPadding - 每一个数据组的 padding
                        GroupHeaderPlacement - 每一个数据组的 header 的显示位置
                            Top - 顶部。默认值
                            Left - 左侧
                        AreStickyGroupHeadersEnabled - 组 header 是否是固定的，即不随组数据的滚动而滚动。默认值为 true
                -->
                <ListView Name="listView2" Margin="5" Width="400" Height="400" HorizontalAlignment="Left" ItemsSource="{x:Bind MyData.View}">
                    <ListView.GroupStyle>
                        <GroupStyle>
                            <GroupStyle.HeaderTemplate>
                                <DataTemplate>
                                    <TextBlock Text="{Binding Title}" />
                                </DataTemplate>
                            </GroupStyle.HeaderTemplate>
                        </GroupStyle>
                    </ListView.GroupStyle>
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Title}" />
                        </DataTemplate>
                    </ListView.ItemTemplate>
                    <ListView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <ItemsStackPanel GroupPadding="4"  
                                             GroupHeaderPlacement="Top" 
                                             AreStickyGroupHeadersEnabled="{Binding IsChecked, ElementName=chkAreStickyGroupHeadersEnabled}" />
                        </ItemsPanelTemplate>
                    </ListView.ItemsPanel>
                </ListView>
                <ComboBox x:Name="cmbGroupHeaderPlacement" Margin="5" PlaceholderText="GroupHeaderPlacement" SelectionChanged="cmbGroupHeaderPlacement_SelectionChanged">
                    <ComboBoxItem>Top</ComboBoxItem>
                    <ComboBoxItem>Left</ComboBoxItem>
                </ComboBox>
                <CheckBox Name="chkAreStickyGroupHeadersEnabled" Content="AreStickyGroupHeadersEnabled" IsChecked="True" Margin="5" />
            </StackPanel>

        </StackPanel>
    </Grid>
</Page>

Controls/CollectionControl/ItemsControlDemo/LayoutControl/ItemsStackPanelDemo.xaml.cs

/*
 * ItemsStackPanel - 虚拟化布局控件，ListView 的默认布局控件（继承自 Panel, 请参见 /Controls/LayoutControl/PanelDemo.xaml）
 *     FirstCacheIndex - 缓存中的第一项在全部数据中的索引位置
 *     FirstVisibleIndex - 屏幕上显示的第一项在全部数据中的索引位置
 *     LastCacheIndex - 缓存中的最后一项在全部数据中的索引位置
 *     LastVisibleIndex - 屏幕上显示的最后一项在全部数据中的索引位置
 *     CacheLength - 可见区外的需要缓存的数据的大小（以可见区条数大小的倍数为单位），默认值为 4.0
 *         比如当可见区可以显示 10 条数据，CacheLength 为 4 时，可见区外的需要缓存的数据的大小则为 4 * 10 = 40，也就是说整个缓存数据的大小为 10 + 4 * 10 = 50
 *         实际测试发现，可能会有一定的偏差，但是大体是准确的
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows10.Common;

namespace Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl
{
    public sealed partial class ItemsStackPanelDemo : Page
    {
        public CollectionViewSource MyData
        {
            get
            {
                XElement root = XElement.Load("SiteMap.xml");
                var items = LoadData(root);

                // 构造数据源
                CollectionViewSource source = new CollectionViewSource();
                source.IsSourceGrouped = true;
                source.Source = items;
                source.ItemsPath = new PropertyPath("Items");

                return source;
            }
        }
        
        private ItemsStackPanel _itemsStackPanel1 = null;
        private ItemsStackPanel _itemsStackPanel2 = null;

        public ItemsStackPanelDemo()
        {
            this.InitializeComponent();

            this.Loaded += ItemsStackPanelDemo_Loaded;
        }

        private void ItemsStackPanelDemo_Loaded(object sender, RoutedEventArgs e)
        {
            DispatcherTimer dTimer = new DispatcherTimer();
            dTimer.Interval = TimeSpan.Zero;
            dTimer.Tick += DTimer_Tick;
            dTimer.Start();

            // 获取 ListView 中的 ItemsStackPanel 控件
            _itemsStackPanel1 = listView1.ItemsPanelRoot as ItemsStackPanel;
            _itemsStackPanel2 = listView2.ItemsPanelRoot as ItemsStackPanel;

            // 获取 ListView 中的 ItemsStackPanel 控件
            // _itemsStackPanel1 = Helper.GetVisualChild<ItemsStackPanel>(listView1);
            // _itemsStackPanel2 = Helper.GetVisualChild<ItemsStackPanel>(listView2);
        }

        private void DTimer_Tick(object sender, object e)
        {
            lblMsg1.Text = "FirstCacheIndex: " + _itemsStackPanel1.FirstCacheIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "FirstVisibleIndex: " + _itemsStackPanel1.FirstVisibleIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "LastCacheIndex: " + _itemsStackPanel1.LastCacheIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "LastVisibleIndex: " + _itemsStackPanel1.LastVisibleIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "CacheLength: " + _itemsStackPanel1.CacheLength.ToString();
        }

        private void cmbGroupHeaderPlacement_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            _itemsStackPanel2.GroupHeaderPlacement = (GroupHeaderPlacement)Enum.Parse(typeof(GroupHeaderPlacement), (e.AddedItems[0] as ComboBoxItem).Content.ToString());
        }

        // 解析 xml 数据
        private List<NavigationModel> LoadData(XElement root)
        {
            if (root == null)
                return null;

            var items = from n in root.Elements("node")
                        select new NavigationModel
                        {
                            Title = (string)n.Attribute("title"),
                            Url = (string)n.Attribute("url"),
                            Items = LoadData(n)
                        };

            return items.ToList();
        }
    }
}

2、ItemsWrapGrid 的示例
Controls/CollectionControl/ItemsControlDemo/LayoutControl/ItemsWrapGridDemo.xaml

<Page
    x:Class="Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl.ItemsWrapGridDemo"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    
    xmlns:common="using:Windows10.Common">

    <Grid Background="Transparent">
        <StackPanel Margin="10 0 10 10" Orientation="Horizontal">

            <StackPanel Margin="5">
                <!--
                    ItemsWrapGrid - 虚拟化布局控件，GridView 的默认布局控件
                        Orientation - 子元素的排列方向
                            Vertical - 垂直排列，默认值
                            Horizontal - 水平排列
                        ItemWidth - 每个 item 的宽
                        ItemHeight - 每个 item 的高
                        MaximumRowsOrColumns - 最大行数或最大列数（默认值为 -1）
                        CacheLength - 可见区外的需要缓存的数据的大小（以可见区条数大小的倍数为单位），默认值为 4.0
                            比如当可见区可以显示 10 条数据，CacheLength 为 4 时，可见区外的需要缓存的数据的大小则为 4 * 10 = 40，也就是说整个缓存数据的大小为 10 + 4 * 10 = 50
                            实际测试发现，可能会有一定的偏差，但是大体是准确的
                -->
                <GridView Name="gridView1" Margin="5" Width="400" Height="400" HorizontalAlignment="Left" ItemsSource="{x:Bind MyData.View}">
                    <GridView.ItemTemplate>
                        <DataTemplate x:DataType="common:NavigationModel">
                            <Grid Background="Blue">
                                <TextBlock Text="{x:Bind Title}" />
                            </Grid>
                        </DataTemplate>
                    </GridView.ItemTemplate>
                    <GridView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <ItemsWrapGrid Orientation="Horizontal" ItemWidth="120" ItemHeight="50" MaximumRowsOrColumns="3" CacheLength="4" />
                        </ItemsPanelTemplate>
                    </GridView.ItemsPanel>
                </GridView>
                <TextBlock Name="lblMsg1" Margin="5" />
            </StackPanel>

            <StackPanel Margin="5">
                <!--
                    ItemsWrapGrid - 虚拟化布局控件，GridView 的默认布局控件
                        GroupPadding - 每一个数据组的 padding
                        GroupHeaderPlacement - 每一个数据组的 header 的显示位置
                            Top - 顶部。默认值
                            Left - 左侧
                        AreStickyGroupHeadersEnabled - 组 header 是否是固定的，即不随组数据的滚动而滚动。默认值为 true
                -->
                <ListView Name="gridView2" Margin="5" Width="400" Height="400" HorizontalAlignment="Left" ItemsSource="{x:Bind MyData.View}">
                    <ListView.GroupStyle>
                        <GroupStyle>
                            <GroupStyle.HeaderTemplate>
                                <DataTemplate>
                                    <TextBlock Text="{Binding Title}" />
                                </DataTemplate>
                            </GroupStyle.HeaderTemplate>
                        </GroupStyle>
                    </ListView.GroupStyle>
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Title}" Width="100" />
                        </DataTemplate>
                    </ListView.ItemTemplate>
                    <ListView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <ItemsWrapGrid Orientation="Horizontal" MaximumRowsOrColumns="3"
                                           GroupPadding="4"
                                           GroupHeaderPlacement="Top" 
                                           AreStickyGroupHeadersEnabled="{Binding IsChecked, ElementName=chkAreStickyGroupHeadersEnabled}" />
                        </ItemsPanelTemplate>
                    </ListView.ItemsPanel>
                </ListView>
                <ComboBox x:Name="cmbGroupHeaderPlacement" Margin="5" PlaceholderText="GroupHeaderPlacement" SelectionChanged="cmbGroupHeaderPlacement_SelectionChanged">
                    <ComboBoxItem>Top</ComboBoxItem>
                    <ComboBoxItem>Left</ComboBoxItem>
                </ComboBox>
                <CheckBox Name="chkAreStickyGroupHeadersEnabled" Content="AreStickyGroupHeadersEnabled" IsChecked="True" Margin="5" />
            </StackPanel>
            
        </StackPanel>
    </Grid>
</Page>

Controls/CollectionControl/ItemsControlDemo/LayoutControl/ItemsWrapGridDemo.xaml.cs

/*
 * ItemsWrapGrid - 虚拟化布局控件，GridView 的默认布局控件（继承自 Panel, 请参见 /Controls/LayoutControl/PanelDemo.xaml）
 *     FirstCacheIndex - 缓存中的第一项在全部数据中的索引位置
 *     FirstVisibleIndex - 屏幕上显示的第一项在全部数据中的索引位置
 *     LastCacheIndex - 缓存中的最后一项在全部数据中的索引位置
 *     LastVisibleIndex - 屏幕上显示的最后一项在全部数据中的索引位置
 *     CacheLength - 可见区外的需要缓存的数据的大小（以可见区条数大小的倍数为单位），默认值为 4.0
 *         比如当可见区可以显示 10 条数据，CacheLength 为 4 时，可见区外的需要缓存的数据的大小则为 4 * 10 = 40，也就是说整个缓存数据的大小为 10 + 4 * 10 = 50
 *         实际测试发现，可能会有一定的偏差，但是大体是准确的
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows10.Common;

namespace Windows10.Controls.CollectionControl.ItemsControlDemo.LayoutControl
{
    public sealed partial class ItemsWrapGridDemo : Page
    {
        public CollectionViewSource MyData
        {
            get
            {
                XElement root = XElement.Load("SiteMap.xml");
                var items = LoadData(root);

                // 构造数据源
                CollectionViewSource source = new CollectionViewSource();
                source.IsSourceGrouped = true;
                source.Source = items;
                source.ItemsPath = new PropertyPath("Items");

                return source;
            }
        }

        private ItemsWrapGrid _itemsWrapGrid1 = null;
        private ItemsWrapGrid _itemsWrapGrid2 = null;

        public ItemsWrapGridDemo()
        {
            this.InitializeComponent();

            this.Loaded += ItemsWrapGridDemo_Loaded;
        }

        private void ItemsWrapGridDemo_Loaded(object sender, RoutedEventArgs e)
        {
            DispatcherTimer dTimer = new DispatcherTimer();
            dTimer.Interval = TimeSpan.Zero;
            dTimer.Tick += DTimer_Tick;
            dTimer.Start();

            // 获取 GridView 中的 ItemsWrapGrid 控件
            _itemsWrapGrid1 = gridView1.ItemsPanelRoot as ItemsWrapGrid;
            _itemsWrapGrid2 = gridView2.ItemsPanelRoot as ItemsWrapGrid;

            // 获取 GridView 中的 ItemsWrapGrid 控件
            // _itemsWrapGrid1 = Helper.GetVisualChild<ItemsWrapGrid>(gridView1);
            // _itemsWrapGrid2 = Helper.GetVisualChild<ItemsWrapGrid>(gridView2);
        }

        private void DTimer_Tick(object sender, object e)
        {
            lblMsg1.Text = "FirstCacheIndex: " + _itemsWrapGrid1.FirstCacheIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "FirstVisibleIndex: " + _itemsWrapGrid1.FirstVisibleIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "LastCacheIndex: " + _itemsWrapGrid1.LastCacheIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "LastVisibleIndex: " + _itemsWrapGrid1.LastVisibleIndex.ToString();
            lblMsg1.Text += Environment.NewLine;
            lblMsg1.Text += "CacheLength: " + _itemsWrapGrid1.CacheLength.ToString();
        }

        private void cmbGroupHeaderPlacement_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            _itemsWrapGrid2.GroupHeaderPlacement = (GroupHeaderPlacement)Enum.Parse(typeof(GroupHeaderPlacement), (e.AddedItems[0] as ComboBoxItem).Content.ToString());
        }

        // 解析 xml 数据
        private List<NavigationModel> LoadData(XElement root)
        {
            if (root == null)
                return null;

            var items = from n in root.Elements("node")
                        select new NavigationModel
                        {
                            Title = (string)n.Attribute("title"),
                            Url = (string)n.Attribute("url"),
                            Items = LoadData(n)
                        };

            return items.ToList();
        }
    }
}

OK
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